So how many people in India use Facebook ?

As of March 2016, Facebook has over 142 million users in India, of which approximately 133 million (93.66%) accessed the site from their mobile phones.

Nearly 69 million people in India use Facebook daily, of which 64 million access the platform through their mobile devices. Source: Vijay Shankar, Facebook Head of Products (Facebook Lite)

Below is a city wise breakdown.

Estimated monthly active users according to adverts : 29 Nov 2015

All India – 137,000,000

Delhi/NCR – 14,000,000

Mumbai – 8,300,000

Bangalore – 9,100,000

Chennai – 11,000,000

Kolkata – 13,000,000

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As of today, about 108,000,000 people use Facebook in India making it the third largest user base for Facebook after USA and Brazil. Roughly 8.9% of Indians use Facebook. As of 2011, there were about 121 million people accessing internet in India. Here is the breakdown of the usage in the top 5 cities in India.